last of the "old" mcat will be given likely in september 2014. you could map it out and see where you stand, it all depends on what classes you take and when. if starting this summer you'd have 4 semesters to take all your prerequisites before the mcat if thats your goal. pushing it, i think, but not impossible.
more importantly to me would be pacing oneself and making all A's in the courses, then take the mcat when you're ready, whether its the old version or not.